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Output devices

For this week assignment we had to :

  • Linked to the group assignment page
  • Documented how you determined power consumption of an output device with your group
  • Documented what you learned from interfacing output device(s) to microcontroller and controlling the device(s)
  • Described your design and fabrication process or linked to previous examples.
  • Explained the programming process/es you used.
  • Outlined problems and how you fixed them
  • Included original design files and code
  • Included a ‘hero shot/video’ of your board

I choose to use servo motors and stepper motors this week. Servo motors are very easy to use, I want my final project to be as easy. Let’s get a servo to work and then reproduce the same function using a stepper motor !

Servo motors

A servo motor is an actuator composed of 3 parts : - A motor (Muscle) - An encoder (Sense) - A control board (Brain)

The word servo has nothing to do with the brain but of all French people do this error since brain is “cerveau” in French which is pronounced like “servo”. Actually it means that the motors is under servitude. Even if I don’t like this idea, the motor is under strict position control. The role of the encoder is to give an information about where the motor is. Usually this data is given in degrees (rotation) or in millimeter/inches for linear actuators. According to this information, the logic has to turn on and of the motor in the according direction to move toward the required position specified by the user. In other words, Servomotor always where they are !

If I want my motor to point to 90°, it should reach that position and then stop until another request is sent. That is the main principle behind this actuator. I used a lot of servos in the past, mostly for robotics prototype. Such as BILLE from machine design week. They’re easy to use and to program.


Last update: June 28, 2022